[Then he stopped in his tracks, adjusted his sunglasses, and turned to face Sei with some kind of very carefully restrained anger.]

One. My name is Waver.

Two. I would be happy to cooperate with you, but ask that you make some faint effort to not openly aggravate me.

Three. I am neither yours or Caster's Master. I don't understand how the hell it works in Chaldea, but that is something I do not take lightly. There is only one person I would ever forge a contract with, and doing so with any other would have to be a matter of life and death. Do I make myself clear, Archer?